摘要
本文发现了脉动风速方差模拟值与设定值存在着误差,分析了引起误差的原因。得到了在不同的湍流尺度与风速比值L/U的情况下,截止频率和初始频率对模拟风速方差的影响,给出了截止频率和初始频率的推荐值,并对Kaimal谱进行了修正。运用修正后的Kaimal谱及平稳随机过程方法,得到了模拟脉动风速时程数据。实例数据表明:模拟脉动风速数据的标准差符合工程应用要求,模拟功率谱与目标风谱吻合得很好。
This paper reveals that obvious errors exist between simulated variance and settled variance, and then analyzes the causes of those errors. The effects of initial frequency and cut-off frequency on the simulated variance are ascertained with different turbulent length/wind speed ratio, frequency are given, and a method is developed to reduce these then the recommended initial frequency and cut-off effects. Using the improved Kaimal spectra and sta- tionary random method, stochastic wind data at hub height is simulated. The wind time-series show that the simula- ted wind velocity satisfies statistical standard deviation demand, and simulated spectra well conform to the target power spectral.
出处
《机械科学与技术》
CSCD
北大核心
2013年第10期1446-1450,共5页
Mechanical Science and Technology for Aerospace Engineering
